en – Original Instructions
ecocirc PRO – Installation, Operation and Maintenance Manual 15
4.3.1 Guidelines for the hydraulic system
• If possible, install the unit at the lowest point of the system.
• Support the pipes independently so that their weight does not load the unit.
• Remove any welding residues, deposits and impurities in the pipes that could damage the
unit.
• Check that other units do not come in contact with the unit.
• When using pump models with pump housing code 65B (item
9 in Figure 3), use the G1/2
check valve (item
14 in Figure 3) supplied in the packaging. This prevents water from flowing
through the pump backwards when any faucet is opened, thus causing damage.
• When using a check valve other than the factory supplied one, pay attention to the
appropriate closing pressure.
• Install the check valve after the pump in the direction of flow, so that the arrows on the pump
housing and on the check valve point in the same direction.
• We recommend that for pump models with pump housing code 65B, you install a ball shut-
off valve before the pump at least, for future maintenance or repair works.
• Pumps with pump housings code 110MB (item
13 in Figure 3) and code 110LB (item 20 in
Figure 3) already contain an integrated check valve (item 19 in Figure 3) and a ball shut-off
valve (item
18 in Figure 3) in the pump housings. (The check valve opens and closes
automatically; the ball shut-off valve is closed when its handle is perpendicular to the pipe
direction).
• With the shut-off valve closed at the suction side of the pump and with the check valve
installed at the discharge side, the union nut (item
5 in Figure 3) can be loosen, thus the
pump motor can be turned in proper position, or even removed for maintenance without
completely draining the system.
• To be able to exclude the complete unit from the system, e.g. for replacement of the pump
housing without draining the system, install additional shut-off valves both at the suction and
at discharge side of the pump.
The next figure shows a typical installation:
Figure 4
1 Water heater 5 Hot water return line
2 Check valve 6 Hot water supply line
3 Circulation pump 7 Cold water supply line
4 Ball shut-off valve
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